Substituted oximes and hydrazones as neurokinin antagonists

ABSTRACT

Compound represented by the structural formula                    
     or a pharmaceutically acceptable salt thereof, wherein: 
     a is 0-3; 
     b, d and e are 0-2; 
     R is H, alkyl, F or —OR 6 ; 
     A is an optionally substituted oxime or hydrazone; 
     d is not 0 and X is a bond, —C(O)—, —O—, —NR 9 —, —S(O) e —, —N(R 6 )C(O)—, —C(O)N(R 6 )—, —OC(O)NR 6 —, —OC(═S)NR 6 —, —N(R 6 )C(═S)O—, —S(O) 2 N(R 6 )—, —N(R 6 )S(O) 2 —, —N(R 6 )C(O)O—, —OC(O)— or —N(R 6 )C(O)NR 7 —; or d is 0 and X is a bond or —NR 6 —; 
     T is H, aryl, heterocycloalkyl or heteroaryl; 
     Q is phenyl, naphthyl or heteroaryl; 
     R 6  is H, alkyl, hydroxyalkyl, alkoxyalkyl, phenyl, and benzyl; 
     R 9  is R 6  or —OR 6    
     R 6a , R 7a , R 8a  and R 9a  are H or alkyl; 
     Z is a nitrogen-containing heterocyclo group, e.g., piperidinyl, substituted by a heterocyclo- or heterocycloalkyl group; 
     wherein phenyl, benzyl, aryl, heterocycloalkyl, heteroaryl and cycloalkyl groups are optionally substituted; methods of treating diseases such as asthma, cough, bronchospasm, depression, emesis, imflammatory diseases, and gastrointestinal disorders with said compounds, and pharmaceutical compositions comprising said compounds are disclosed.

CROSS REFERENCE TO RELATED APPLICATIONS

This application is a divisional of U.S. Ser. No. 09/759,045, filed Jan. 12, 2001, which is a divisional of U.S. Ser. No. 09/468,591, filed Dec. 21, 1999 now U.S. Pat. No. 6,204,265, which claims the benefit of U.S. Provisional Application No. 60/113,404, filed Dec. 23, 1998.

BACKGROUND OF THE INVENTION

The present invention relates to a genus of substituted oximes and hydrazones useful as antagonists of tachykinin receptors, in particular as antagonists of the neuropeptides neurokinin-1 receptor (NK₁) and/or neurokinin-2 receptor (NK₂) and/or neurokinin-3 receptor (NK₃).

Neurokinin receptors are found in the nervous system and the circulatory system and peripheral tissues of mammals, and therefore are involved in a variety of biological processes. Neurokinin receptor antagonists are consequently expected to be useful in the treatment or prevention of various mammalian disease states, for example asthma, cough, bronchospasm, inflammatory diseases such as arthritis, central nervous system conditions such as migraine and epilepsy, nociception, depression, and various gastrointestinal disorders such as Crohn's disease.

In particular, NK₁ receptors have been reported to be involved in microvascular leakage and mucus secretion, and NK₂ receptors have been associated with smooth muscle contraction, making NK₁ and NK₂ receptor antagonists especially useful in the treatment and prevention of asthma.

Substituted oxime and hydrazone NK₁ and NK₂ receptor antagonists have previously been disclosed in U.S. Pat. No. 5,696,267, U.S. Pat. No. 5,688,960, and U.S. Pat. No. 5,789,422.

SUMMARY OF THE INVENTION

Compounds of the present invention are represented by the formula I

or a pharmaceutically acceptable salt thereof, wherein:

a is 0, 1, 2 or 3;

b and d are independently 0, 1 or 2;

R is H, C₁₋₆ alkyl, —OR⁶ or —F;

A is ═N—OR¹ or ═N—N(R²)(R³);

when d is not 0, X is a bond, —C(O)—, —O—, —NR⁹—, —S(O)_(e)—, —N(R⁶)C(O)—, —C(O)N(R⁶)—, —OC(O)NR⁶—, —OC(═S)NR⁶—, —N(R⁶)C(═S)O—, —S(O)₂N(R⁶)—, —N(R⁶)S(O)₂—, —N(R⁶)C(O)O—, —OC(O)— or —N(R⁶)C(O)NR⁷; and

when d is 0, X is a bond or —NR⁶—;

T is H, R⁴-aryl, R⁴-heterocycloalkyl or R⁴-heteroaryl;

Q is R⁵-phenyl, R⁵-naphthyl or R⁵-heteroaryl;

R¹ is H, C₁₋₆ alkyl, —(C(R⁶)(R⁷))_(n)—G, —G², —(C(R⁶)(R⁷))_(p)—M—(C(R¹³)(R¹⁴))_(n)—G or —(C(R⁶)(R⁷))_(p)—M—(R⁴-heteroaryl);

R² and R³ are independently selected from the group consisting of H, C₁₋₆ alkyl, —(C(R⁶)(R⁷))_(n)—G, —G² and —S(O)_(e)R¹³; or R² and R³, together with the nitrogen to which they are attached, form a ring of 5 to 6 members, wherein 0, 1 or 2 ring members are selected from the group consisting of —O—, —S— and —N(R¹⁹)—;

R⁴ and R⁵ are independently 1-3 substituents independently selected from the group consisting of H, halogeno, —OR⁶, —OC(O)R⁶, —OC(O)N(R⁶)(R⁷), —N(R⁶)(R⁷), C₁₋₆ alkyl, —CF₃, —C₂F₅, —COR⁶, —CO₂R⁶, —CON(R⁶)(R⁷), —S(O)_(e)R¹³, —CN, —OCF₃, —OCHF₂, —NR⁶CO₂R¹⁶, —NR⁶COR⁷, —NR⁸CON(R⁶)(R⁷), NO₂, —N(R⁶)S(O)₂R¹³ or —S(O)₂N(R⁶)(R⁷); or adjacent R⁴ substituents or adjacent R⁵ substituents can form a —O—CH₂—O— group;

R⁶, R⁷, R⁸, R¹³ and R¹⁴ are independently selected from the group consisting of H, C₁₋₆ alkyl, C₂-C₆ hydroxyalkyl, C₁-C₆ alkoxy-C₁-C₆ alkyl, R¹⁵-phenyl, and R¹⁵-benzyl;

R⁹ is independently selected from the group consisting of R⁶ and —OR⁶;

or R⁶ and R⁷, or R⁷ and R⁹, together with the nitrogen to which they are attached, form a ring of 5 to 6 members, wherein 0, 1 or 2 ring members are selected from the group consisting of —O—, —S— and —N(R¹⁹)—;

R^(6a), R^(7a), R^(8a), R^(9a), R¹⁰ and R^(10a) are independently selected from the group consisting of H and C₁₋₆ alkyl;

R¹⁵ is 1 to 3 substituents independently selected from the group consisting of H, —OH, C₁-C₆ alkyl, C₁-C₆ alkoxy, C₁-C₆ alkylthio, halogeno, —CF₃, —C₂F₅, —COR¹⁰, —CO₂R¹⁰, —C(O)N(R¹⁰)₂, —S(O)_(e)R^(10a), —CN, —N(R¹⁰)COR¹⁰, —N(R¹⁰)CON(R¹⁰)₂ and —NO₂;

R¹⁶ is C₁₋₆ alkyl, R¹⁵-phenyl or R¹⁵-benzyl;

R¹⁹ is H, C₁-C₆ alkyl, —C(O)N(R¹⁰)₂ or —CO₂R¹⁰;

n and p are independently 1-6;

G is selected from the group consisting of H, R⁴-aryl, R⁴-hetero-cycloalkyl, R⁴-heteroaryl, R⁴-cycloalkyl, —CH₂F, —CHF₂, —CF₃, —OR⁶, —N(R⁶)(R⁷), —COR⁶, —CO₂R⁶, —CON(R⁷)(R⁹), —S(O)_(e)R¹³, —NR⁶CO₂R¹⁶, —NR⁶COR⁷, —NR⁸CON(R⁶)(R⁷), —N(R⁶)S(O)₂R¹³, —N(R⁶)S(O)₂N(R³³)(R³⁴), —S(O)₂N(R⁶)(R⁷), —OC(O)R⁶, —OC(O)N(R⁶)(R⁷), —C(═NOR⁸)N(R⁶)(R⁷), —C(═NR²⁵)N(R⁶)(R⁷), —N(R⁸)C(═NR²⁵)N(R⁶)(R⁷), —CN, —C(O)N(R⁶)OR⁷, and —C(O)N(R⁹)—(R⁴-heteroaryl), provided that when n is 1, G is not —OH or —N(R⁶)(R⁷);

M is selected from the group consisting of a double bond, —O—, —N(R⁶)—, —C(O)—, —C(R⁶)(OR⁷)—, —C(R⁸)(N(R⁶)(R⁷))—, —C(═NOR⁶)N(R⁷)—, —C(N(R⁶)(R⁷))═NO—, —C(═NR²⁵)N(R⁶)—, —C(O)N(R⁹)—, —N(R⁹)C(O)—, —C(═S)N(R⁹)—, —N(R⁹)C(═S)— and —N(R⁶)C(O)N(R⁷)—, provided that when n is 1, G is not OH or —NH(R⁶); and when p is 2-6, M can also be —N(R⁶)C(═NR²⁵)N(R⁷)—or —OC(O)N(R⁶)—;

G² is R⁴-aryl, R⁴-heterocycloalkyl, R⁴-heteroaryl, R⁴-cycloalkyl, —COR⁶, —CO₂R¹⁶, —S(O)₂N(R⁶)(R⁷) or —CON(R⁶)(R⁷);

e is 0, 1 or 2, provided that when e is 1 or 2, R¹³ and R^(10a) are not H;

R²⁵ is H, C₁-C₆ alkyl, —CN, R¹⁵-phenyl or R¹⁵-benzyl;

Z is

g, h and j are independently 0-2;

k is1-4;

X¹ is —O—, —S— or —NR⁹—;

J is ═O, ═S, ═NR⁹, ═NCN or ═NOR¹;

J¹ and J² are independently selected from the group consisting of two hydrogen atoms, ═O, ═S, ═NR⁹ and ═NOR¹;

R²⁶, R²⁷ and R²⁹ are independently selected from the group consisting of H, C₁₋₆ alkyl, —(C(R⁶)(R⁷))_(n)—G, —G², —C(O)—(C(R⁸)(R⁹))_(n)—G and —S(O)_(e)R¹³;

R²⁸ is H, —(C(R⁶)(R⁷))_(t)—G or —CON(R⁶)(R⁷);

t is 0, 1, 2 or 3, provided that when j is 0, t is 1, 2 or3;

R³⁰ is 1-3 substituents independently selected from the group consisting of H, halogeno, —OR⁶, —OC(O)R⁶, —OC(O)N(R⁶)(R⁷), —N(R⁶)(R⁷), C₁₋₆ alkyl, —CF₃, —C₂F₅, —COR⁶, —CO₂R⁶, —CON(R⁶)(R⁷), —S(O)_(e)R¹³, —CN, —OCF₃, —NR⁶CO₂R¹⁶, —NR⁶COR⁷, —NR⁸CON(R⁶)(R⁷), NO₂, —N(R⁶)S(O)₂R¹³ or —S(O)₂N(R⁶)(R⁷); or adjacent R³⁰ substituents can form a —O—CH₂—O—group;

R³¹ is independently selected from the group consisting of H and C₁-C₆ alkyl;

R³² is independently selected from the group consisting of H, —OH and C₁-C₆ alkoxy; and

R³³ and R³⁴ are independently selected from the group consisting of H, C₁-C₆ alkyl, R¹⁵-phenyl and R¹⁵-benzyl.

Preferred are compounds of formula I wherein X is —O—, —C(O)—, a bond, —NR⁶—, —S(O)_(e)—, —N(R⁶)C(O)—, —OC(O)NR⁶ or —C(═NOR¹)—. More preferred are compounds of formula I wherein X is —O—, —NR⁶—, —N(R⁶)C(O)— or —OC(O)NR⁶. Additional preferred definitions are: b is 1 or 2 when X is —O— or —N(R⁶)—; b is 0 when X is —N(R⁶)C(O)—; and d is 1 or 2. T is preferably R⁴-aryl, with R⁴-phenyl being more preferred. Also preferred are compounds wherein R^(6a), R^(7a), R^(8a) and R^(9a) are independently hydrogen, hydroxyalkyl or alkoxyalkyl, with thydrogen being more preferred. Especially preferred are compounds wherein R^(8a) and R^(9a) are each hydrogen, d and b are each 1, X is —O—, —NR⁶—, —N(R⁶)C(O)— or —OC(O)NR⁶, T is R⁴-aryl and R⁴ is two substituents selected from C₁-C₆ alkyl, halogeno, —CF₃ and C₁-C₆ alkoxy.

Also preferred are compounds of formula I wherein R is hydrogen. Q is preferably R⁵-phenyl; an especially preferred definition for Q is R⁵-phenyl, wherein R⁵ is two halogeno substituents.

Preferred are compounds of formula I wherein A is ═N—OR¹. R¹ is preferably H, alkyl, —(CH₂)_(n)—G, —(CH₂)_(p)—M—(CH₂)_(n)—G or —C(O)N(R⁶)(R⁷), wherein M is —O— or —C(O)N(R⁹)— and G is —CO₂R⁶, —OR⁶, —C(O)N(R⁷)(R⁹), —C(═NOR⁸)N(R⁶)(R⁷), —C(O)N(R⁹)(R⁴-heteroaryl) or R⁴-heteroaryl. When A is ═N—N(R²)(R³), R² and R³ are independently preferably H, C₁-C₆ alkyl, —(C(R⁶)(R⁷))_(n)—G or G².

Preferred definition of are

Variables g and h are preferably each 1; J is preferably ═O; j is preferably 0; k is preferably 1 or 2; and R²⁸ is preferably H.

A more preferred definition of Z is

wherein k is preferably 1 or 2.

This invention also relates to the use of a compound of formula I in the treatment of for example respiratory diseases such as chronic lung disease, bronchitis, pneumonia, asthma, allergy, cough, bronchospasm; inflammatory diseases such as arthritis and psoriasis; skin disorders such as atopic dermatitis and contact dermatitis; ophthamalogical disorders such as retinitis, ocular hypertension and cataracts; addictions such as alcohol dependence and stress related disorders; central nervous system conditions such as anxiety, migraine, epilepsy, nociception, emesis, depression, psychosis, schizophrenia, Alzheimer's disease, AIDs related dementia and Towne's disease; gastrointestinal disorders such as Crohn's disease and colitis; bladder disorders; atherosclerosis; fibrosing disorders; and obesity.

In another aspect, the invention relates to a pharmaceutical composition comprising a compound of formula I in a pharmaceutically acceptable carrier. The invention also relates to the use of said pharmaceutical composition in the treatment of the mammalian disease states listed above.

DETAILED DESCRIPTION

As used herein, the term “alkyl” means straight or branched alkyl chains. “Lower alkyl” refers to alkyl chains of 1-6 carbon atoms and, similarly, lower alkoxy refers to alkoxy chains of 1-6 carbon atoms.

“Cycloalkyl” means cyclic alkyl groups having 3 to 6 carbon atoms.

“Aryl” means phenyl, naphthyl, indenyl, tetrahydronaphthyl, indanyl, anthracenyl or fluorenyl.

“Halogeno” refers to fluoro, chloro, bromo or iodo atoms.

“Heterocycloalkyl” refers to 4- to 6-membered saturated rings comprising 1 to 3 heteroatoms independently selected from the group consisting of —O—, —S— and —N(R¹⁹)—, with the remaining ring members being carbon. Examples of heterocycloalkyl rings are tetrahydrofuranyl, pyrrolidinyl, piperidinyl, morpholinyl, thiomorpholinyl and piperazinyl. R⁴-heterocycloalkyl refers to such groups wherein substitutable ring carbon atoms have an R⁴ substituent.

“Heteroaryl” refers to 5- to 10-membered single or benzofused aromatic rings comprising 1 to 4 heteroatoms independently selected from the group consisting of —O—, —S— and —N═, provided that the rings do not include adjacent oxygen and/or sulfur atoms. Examples of single-ring heteroaryl groups are pyridyl, isoxazolyl, oxadiazolyl, furanyl, pyrrolyl, thienyl, imidazolyl, pyrazolyl, tetrazolyl, thiazolyl, thiadiazolyl, pyrazinyl, pyrimidinyl, pyridazinyl and triazolyl. Examples of benzofused heteroaryl groups are indolyl, quinolinyl, thianaphthenyl and benzofurazanyl. N-oxides of nitrogen-containing heteroaryl groups are also included. All positional isomers are contemplated, e.g., 1-pyridyl, 2-pyridyl, 3-pyridyl and 4-pyridyl. R⁴-heteroaryl refers to such groups wherein substitutable ring carbon atoms have an R⁴ substituent.

Where R² and R³, or R⁶ and R⁷ substituents on a nitrogen atom form a ring and additional heteroatoms are present, the rings do not include adjacent oxygen and/or sulfur atoms or three adjacent hetero-atoms. Typical rings so formed are morpholinyl, piperazinyl and piperidinyl.

In the above definitions, wherein variables R⁶, R⁷, R⁸, R¹³, R¹⁴, R¹⁵, R³⁰, R³¹ and R³², for example, are said to be independently selected from a group of substituents, we mean that R⁶, R⁷, R⁸, R¹³, R¹⁴, R¹⁵, R³⁰, R³¹ and R³² are independently selected, but also that where an R⁶, R⁷, R⁸, R¹³, R14, R¹⁵, R³⁰ R³¹ or R³² variable occurs more than once in a molecule, those occurrences are independently selected (e.g., if R is —OR⁶ wherein R⁶ is hydrogen, X can be —N(R⁶)— wherein R⁶ is ethyl). Similarly, R⁴ and R⁵ can be independently selected from a group of substituents, and where more than one R⁴ and R⁵ are present, the substituents are independently selected; those skilled in the art will recognize that the size and nature of the substituent(s) will affect the number of substituents which can be present.

Compounds of formula I can have at least one asymmetrical carbon atom and all isomers, including diastereomers, enantiomers and rotational isomers, as well as E and Z isomers of the oxime, hydrazone and olefin groups, are contemplated as being part of this invention. The invention includes d and I isomers in both pure form and in admixture, including racemic mixtures. Isomers can be prepared using conventional techniques, either by reacting optically pure or optically enriched starting materials or by separating isomers of a compound of formula I.

Those skilled in the art will appreciate that for some compounds of formula I, one isomer will show greater pharmacological activity than other isomers.

Compounds of the invention have at least one amino group which can form pharmaceutically acceptable salts with organic and inorganic acids. Examples of suitable acids for salt formation are hydrochloric, sulfuric, phosphoric, acetic, citric, oxalic, malonic, salicylic, malic, fumaric, tartaric, succinic, ascorbic, maleic, methanesulfonic and other mineral and carboxylic acids well known to those in the art. The salt is prepared by contacting the free base form with a sufficient amount of the desired acid to produce a salt. The free base form may be regenerated by treating the salt with a suitable dilute aqueous base solution such as dilute aqueous sodium bicarbonate. The free base form differs from its respective salt form somewhat in certain physical properties, such as solubility in polar solvents, but the salt is otherwise equivalent to its respective free base forms for purposes of the invention.

Certain compounds of the invention are acidic (e.g., those compounds which possess a carboxyl group). These compounds form pharmaceutically acceptable salts with inorganic and organic bases. Examples of such salts are the sodium, potassium, calcium, aluminum, gold and silver salts. Also included are salts formed with pharmaceutically acceptable amines such as ammonia, alkyl amines, hydroxyalkylamines, N-methylglucamine and the like.

Compounds of formula I can be prepared using methods well known to those skilled in the art, for example by procedures disclosed in U.S. Pat. No. 5,696,267, incorporated herein by reference. The skilled artisan will recognize that other procedures may be applicable, and that the procedure may be suitably modified to prepare other compounds within the scope of formula I.

Compounds of formula I as defined are preferably prepared as shown in the following reaction scheme as disclosed in U.S. Pat. No. 5,696,267. In the reaction scheme, the variables are as defined above:

In step 1, a compound of formula 47A. wherein Q is as defined above, is reacted with a base such as lithium diisopropylamide (LDA), KHMDS or KH in an inert organic solvent such as THF or DME to generate a dianion. An acid chloride, ester or amide of formula 46A, 46B, or 46C is added to give a ketcrne of formula 48. Preferable reaction temperatures ranges from −78° C. to 30° C.

Alternatively, compounds of formula 48 can be generated by the reaction of a compound of formula 46, preferably 46C, with a metallated species of formula QCH₂Mt where Mt is a metal, such as lithium or MgHal, wherein “Hal” is halogen. The metallated species QCH₂Mt can be generated by conventional procedures, such as treatment compounds of formula QCH₂Hal with Mg or by treating QCH₃ with an organolithium base.

In step 2, for compounds wherein R is not hydrogen, the ketone 48 is reacted with a suitable base, such as LDA or KH in an inert organic solvent such as THF. For compounds wherein R is alkyl or hydroxyalkyl, a compound R—R¹⁷″, wherein R¹⁷″ is leaving group such as Br, I ortriflate is added. For compounds wherein R is OH, an appropriate oxidizing agent such as dimethyldioxirane or Davis reagent is added. Preferable reaction temperatures range from −78° to 50° C. For compounds of the present invention wherein R is H, the ketone 48 is used directly in Step 3.

In step 3, ketone 49 is reacted with a base such as LDA in a solvent such as THF, then an olefin of formula 50 is added, wherein R¹⁷″ is as defined above, to give the adduct 51. Preferable reaction temperatures range from −78° C. to 60° C.

In step 4, ketone 51 is reacted with HA′, wherein A′ is NH—OR¹, in an organic solvent such as pyridine or ethanol at a temperature from 25° C. to 150° C. to give a compound of formula 52.

In step 5, a compound of formula 52 is oxidized by ozonolysis to give an aldehyde of formula 53. Suitable organic solvents include EtOAc, CH₃OH, ethanol, CH₂Cl₂ or the like. Preferable reaction temperatures are from −78 to 0° C.

In step 6, an aldehyde of formula 53 is reacted with a compound of formula Z—H, wherein Z is as defined above. The reaction is preferably carried out with a suitably substituted amine (as its acid salt e.g. HCl or maleate or as its free base) and a hydride source such as NaBH₃CN or sodium triacetoxyborohydride in a suitable solvent (e.g. CH₃OH, CH₃CH₂OH, or CF₃CH₂OH for NaBH₃CN, or THF, 1,2-dichloroethane, CH₃CN or CF₃CH₂OH for triacetoxyborohydride), with 3A sieves to obtain the desired product. Any suitable temperature can be used with preferable temperatures between 0° C. and 25° C.

Alternatively, a compound of formula I can be prepared from 51 by the following reaction scheme, wherein the variables are as defined for the cited U.S. patent:

Compound 51 is oxidized to a compound of formula 54 under conditions similar to those described for step 5 above. The aldehyde of formula 54 is reacted with a compound of formula Z—H in a manner similar to that described in Step 6, and the resultant ketone is then reacted with a compound of the formula HA′ as described above in Step 4 to obtain the compound of formula I.

Starting “ZH” groups are known or are made by procedures known in the art. See, for example, the following Preparations 3-12.

Reactive groups not involved in the above processes can be protected during the reactions with conventional protecting groups which Q can be removed by standard procedures after the reaction. The following Table 1 shows some typical protecting groups:

TABLE 1 Group to be Protected Group to be Protected and Protecting Group —COOH —COOalkyl, —COObenzyl, —COOphenyl

—NH₂

—OH —OCH₃, —OCH₂OCH₃, —OSi(CH₃)₃,

For preparing pharmaceutical compositions from the compounds described by this invention, inert, pharmaceutically acceptable carriers can be either solid or liquid. Solid form preparations include powders, tablets, dispersible granules, capsules, cachets and suppositories. The powders and tablets may be comprised of from about 5 to about 95 percent active ingredient. Suitable solid carriers are known in the art, e.g. magnesium carbonate, magnesium stearate, talc, sugar or lactose. Tablets, powders, cachets and capsules can be used as solid dosage forms suitable for oral administration. Examples of pharmaceutically acceptable carriers and methods of manufacture for various compositions may be found in A. Gennaro (ed.), Remington's Pharmaceutical Sciences, 18th Edition, (1990), Mack Publishing Co., Easton, Pa.

Liquid form preparations include solutions, suspensions and emulsions. As an example may be mentioned water or water-propylene glycol solutions for parenteral injection or addition of sweeteners and opacifiers for oral solutions, suspensions and emulsions. Liquid form preparations may also include solutions for intranasal administration.

Aerosol preparations suitable for inhalation may include solutions and solids in powder form, which may be in combination with a pharmaceutically acceptable carrier, such as an inert compressed gas, e.g. nitrogen.

Also included are solid form preparations which are intended to be converted, shortly before use, to liquid form preparations for either oral or parenteral administration. Such liquid forms include solutions, suspensions and emulsions.

The compounds of the invention may also be deliverable transdermally. The transdermal compositions can take the form of creams, lotions, aerosols and/or emulsions and can be included in a transdermal patch of the matrix or reservoir type as are conventional in the art for this purpose.

Preferably the compound is administered orally.

Preferably, the pharmaceutical preparation is in a unit dosage form. In such form, the preparation is subdivided into suitably sized unit doses containing appropriate quantities of the active component, e.g., an effective amount to achieve the desired purpose.

The quantity of active compound in a unit dose of preparation for treatment of asthma, cough, bronchospasm, inflammatory diseases, migraine, nociception, depression, emesis and gastrointestinal disorders may be varied or adjusted from about 1 mg to about 1500 mg, preferably from about 50 mg to about 500 mg, more preferably from about 20 mg to about 200 mg, according to the particular application.

The actual dosage employed may be varied depending upon the requirements of the patient and the severity of the condition being treated. Determination of the proper dosage regimen for a particular situation is within the skill of the art. For convenience, the total daily dosage may be divided and administered in portions during the day as required.

The amount and frequency of administration of the compounds of the invention and/or the pharmaceutically acceptable salts thereof will be regulated according to the judgment of the attending clinician considering such factors as age, condition and size of the patient as well as severity of the symptoms being treated. A typical recommended daily dosage regimen for oral administration can range from about 1 mg/day to about 1500 mg/day, in two to four divided doses.

Following are examples of preparing starting materials and compounds of formula I. As used herein, Me is methyl, Bu is butyl, Br is bromo, Ac is acetyl, Et is ethyl and Ph is phenyl.

PREPARATION 1

Prepared using methods described in U.S. Pat. No. 5,696,267.

PREPARATION 2

Prepared using methods described in U.S. Pat. No. 5,696,267.

PREPARATION 3

Step 1: Treat a solution of 1-benzyl-4-amino piperidine (25 g, 0.13 mol) in CH₃OH (5 mL) with acrylonitrile (9.6 mL, 0.15 mol) at 23° C. Stir for 22 h, and concentrate to yield the crude product.

Step 2: Dissolve the product of Step 1 (31.9 g, 0.13 mol) in CH₃OH (1 L) add cobalt (II) chloride (34 g, 0.26 mol) followed by NaBH₄ (50 g, 0.13 mol) in several small portion over 45 min at 0° C. Allow the resulting suspension to stir for 1.5 h, carefully acidify with 3 N HCl until the color turns pink. Extract the aqueous solution with ether (Et₂O) (1 L), add NaOH at 10° C. until pH=12. Extract the resulting suspension with Et₂O (1 L), then CH₂Cl₂ (2×1 L). Filter the aqueous layer to remove the solid material, and further extract with CH₂Cl₂ (3×1 L). Concentrate the combined organic layer to give 23.6 g of the desired product.

Step 3: Dissolve the product of Step 2 (10.0 g, 0.41 mol) in anhydrous tetrahydrofuran (THF) (70 mL), treat with carbonyldiimidazole (13.2 g, 0.81 mol), and heat to 60° C. for 14 h. Concentrate the mixture, and filter through a silica plug with CH₂Cl₂ and CH₃OH (sat. with NH₃) at a ratio of 94:6 to give 8.6 g of the title product.

PREPARATION 4

Step 1: Treat a solution of 4-amino-N-benzyl piperidine (20.4 mL, 0.10 mol) in CHCl₃ (30 mL) with phthalide anhydride (10.0 g, 0.068 mol) and heat the mixture to reflux at 70 ° C. for 18 h. Add water and CH₂Cl₂, separate the layers, extract the aqueous layer with CH₂Cl₂ (2×40 mL), wash the combined organic layers with brine, concentrate and purify the mixture with column chromatography, eluting with CH₂Cl₂ and CH₃OH (sat. with NH₃) at a ratio of 99:1 to give 6.9 g of the desired product.

Step 2: Dissolve the product of Step 1 in acetic acid (HOAc) (10 mL), add zinc dust (1.28 g, 20 mmol) and heat to reflux at 120° C. for 12 h. After cooling the mixture, slowly add NaHCO₃ (sat.) solution until pH=10, separate the layers, extract the aqueous layer with CH₂Cl₂ (2×40 mL), wash the combined organic layers with brine, concentrate the mixture, and purify by column chromatography, eluting with EtOAc:hexane (1:1) with 2% triethylamine (TEA) to give 0.50 g product.

PREPARATION 5

Treat a solution of 4-amino-N-benzyl piperidine (1.0 g, 5.26 mmol) and 2-acetylbenzoic acid (1.0 g, 6.10 mmol) in dichloroethane (10 mL) with NaBH₃CN (0.37 g, 6.0 mmol) and stir at 23° C. for 24 h. Heat the mixture to 80° C. for an additional 24 h. Add water (30 mL) and EtOAc (30 mL), filter through celite, separate layers of filtrate and concentrate the organic layer. Purify by column chromatography, eluting with EtOAc:hexane (1:2) with 2% TEA to give 0.86 g product.

PREPARATION 6

Dissolve the product of Preparation 4, Step 1 (0.76 g, 2.38 mmol) in anhydous THF (6 mL) and add CH₃MgBr (3 M, 2 mL, 6 mmol) at 0° C. Warm the mixture and stir at 23° C for 3 h. Quench with water and CH₂Cl₂ at 0° C., separate the layers, and extract the aqueous layer with CH₂Cl₂ (2×40 mL), wash the combined organic layer with brine and concentrate to give 0.68 g product.

PREPARATION 7

Using procedures known in the art, treat a solution of 3,4-dichloro-phenylacetic acid with N-t-BOC-sarcosine methyl ester and separately treat 2-bromo-ethanol with t-butyldimethylsilylchloride. React the product of the first step with NaH, and add the product of the second step and Nal. Treat the resultant product with O-methoxylamine HCl, followed by deprotection using HCl in CH₂Cl₂. Chiral material was obtained by chiral separation using HPLC.

PREPARATION 8

Step 1: Treat a solution of t-butyl-n-(2-aminoethyl)carbamate (18.6 g, 116 mmol) and 1-benzyl-4-piperidone (20 g, 106 mmol) in CH₂Cl₂ (300 mL) with HOAc (4.1 g, 68 mmol) and sodium triacetoxyborohydride (25 g, 118 mmol) at 0° C., and stir for an additional 15 h at 23° C. Add NaHCO₃ (sat.) (150 mL) and extract with CH₂Cl₂ (150 mL×2), wash the combined organic layer with brine and concentrate to give 35.5 g product.

Step 2: Dissolve the product of Step 1 (7 g, 21 mmol) and Et₃N (6.37 g, 63 mmol) in CH₂Cl₂ (200 mL), add chloroacetyl chloride (2.85 g, 25 mmol), and stir for 2 h at 23° C. Add NaHCO₃ solution (150 mL) and extract with CH₂Cl₂ (150 mL×2), wash the combined organic layer with brine and concentrate. Purify by column chromatography, eluting with CH₂Cl₂ and CH₃OH (sat. with NH₃) at a ratio of 97:3 to give 5.3 g product.

Step 3: Dissolve the product of Step 2 (5.3 g, 12.0 mmol) in CH₂Cl₂ with trifluoroacetic acid (15 mL) and stir for 1 h at 23° C. Remove the solvent under reduced pressure and dilute with CH₂Cl₂ and NaOH (1 M) until pH=10. Extract with CH₂Cl₂ (150 mL×2), wash the combined organic layer with brine, and concentrate to yield 3.3 g of the title compound.

PREPARATION 9

Step 1: Use a procedure similar to Step 1 of Preparation 8, substituting glycine methyl ester hydrochloride for t-butyl-n-(2-aminoethyl)carbamate and HOAc.

Step 2: Treat the product of Step 1 with Boc-glycine using an amidation procedure similar to Step 1 of Example 7A.

Step 3: Treat the product of Step 2 with trifluoroacetic acid using a procedure similar to Step 3 of Preparation 8 to obtain the title compound.

PREPARATION 10

Step 1: Dissolve 4-benzyl-piperidone (11.48 g, 50.7 mmol) in EtOH (60 mL), treat with 3-aminopropanol (8.29 g, 110.4 mmol) and stir for 90 min. Cool to 0° C. and add HCl in dioxane (14 mL, 56 mmol), followed by NaBH₃CN (7.8 g, 124 nmol). Allow the mixture to warm up to 23° C., and stir for additional 20 h. Quench with water and dilute with EtOAc, separate the organic layer and basify the aqueous layer until pH>10. Extract the organic layer with EtOAc (2×100 mL), wash the combined organic layer with brine and concentrate. Purify by column chromatography, eluting with CH₂Cl₂ and CH₃OH (sat. with NH₃) at a ratio of 94:6 to give 7.5 g product.

Step 2: Treat the product of step 1 using procedure similar to Preparation 3, Step 3, to give 6.6 g of the title compound.

PREPARATION 11

To a 5L 3-neck flask equipped with a mechanical stirring apparatus and charged with 1,2 dichloroethane (400 mL), add N-Boc-piperidone (20 g, 100 mmol, 1 eq) followed by 3-amino-1-propanol (9.21 mL, 120 mmol, 1.2 eq) and stir for 30 min. Add Na(OAc)₃BH (25.4 g, 120 mmol, 1.2 eq) and stir for 4 h. Cool reaction to 0° C. and add 300 mL of saturated aqueous NaHCO₃. Add p-nitrophenylchloroformate (30.25g, 150 mmol, 1.5 eq), stir for 90 min and store for 14 h at −20° C. Warm to 0° C. and check for complete reaction by TLC. Prepare a solution of NaBr (11.3 g, 110 mmol, 1.1 eq in 300 mL of saturated aqueous NaHCO₃ (sonicate for 5 min)) and add to the reaction vessel. Add TEMPO (156 mg, 1 mmol). With vigorous stirring, use a 500 mL addition funnel to add 300 mL of commercial bleach (ca 0.7 M, 220 mmol, 2.2 eq). If reaction is not complete as shown by TLC, add bleach in small portions (25 mL) until complete. When TLC shows complete reaction, add saturated aqueous Na₂S₂O₃ (300 mL) and transfer to a separatory funnel. Isolate the organic layer and extract the aqueous layer with CH₂Cl₂ (2×1 L). Combine the organic layers and wash with saturated aqueous NaHCO₃ (1 L). Back extract the last aqueous wash with 1 L CH₂Cl₂, dry over Na₂SO₄ and concentrate to give 65 g crude product. Purify by silica gel chromatography using 800 g silica, eluting with hexane/EtOAc gradient elution (2:1→1:1) to obtain 36.5 g (87%) of the desired aldehyde.

PREPARATIONS 12A-12O

Prep. no. R²⁶ 12A CH₃ 12B (CH₃)₂CH 12C

12D

12E

12F

12G

12H

12I

12J

12K

12L

12M

12N OH 12O

12P

12Q

12R

12S

12T

12U

PREPARATION 12A

Step 1: Using a procedure similar to Preparation 11 with phenyl chloroformate in place of 4-nitrophenylchloroformate, prepare the corresponding phenyl carbamate aldehyde.

Step 2: Stir a solution of the product of step 1 (5 g, 13.2 mmol), NH₂CH₃ (7.3 mL of 2M in THF), in 2,2,2-trifluoroethanol (150 mL) for 30 min, then add 4.67 g of Na(OAc)₃BH and stir for 18 h. Filter through a frit, rinse with EtOAc, wash the filtrate with sat NaHCO₃ then brine, dry with Na₂SO₄ and concentrate in vacuo. Dissolve the crude in DMF (100 mL) and heat to 100° C. for 1 h. Remove the DMF in vacuo and purify by silica gel chromatography, eluting with EtOAc/CH₃OH 9:1 to obtain 2.46 g of the desired boc-piperidine.

Step 3: Dissolve the product of step 2 in 30 mL of CH₂Cl₂ (30 mL) at 0° C. and treat with 50 mL of HCl/dioxane (4N) and stir until no starting material remains by TLC . Concentrate in vacuo and filter the resulting HCl salt through a plug of silica gel, eluting with CH₂Cl₂/CH₃OH (sat with NH₃) to obtain the desired piperidine free base.

PREPARATION 12B

Using a procedure similar to Preparation 12A, substitute isopropylamine for NH₂CH₃ and heat to 125° C. for 6-8h instead of 100° C. for 1 h in step 2.

PREPARATION 12C-12H

Step 1: Using a procedure similar to that of Preparation 1 2A, substituting the product of Preparation 11 for the phenyl carbamate in step 1 and using the appropriate amine, the corresponding Boc-piperidines were prepared. For insoluble amines (Prep. 12D) 1-20% Et₃N was added to 2,2,2 trifluoroethanol as a co-solvent in step 2. In step 2, hindered amines (Prep. 12H) may require sustained heating (120° C., 4-5 d) in DMF for cyclization to occur. For less hindered amines, cyclization may be spontaneous and may not require heating in DMF.

Step 2: Deprotect, using a procedure similar to Preparation 12A, step 3.

PREPARATION 12I-12L

Treat a solution (0.05-0.25 mmol) of the desired Boc protected piperidine obtained from Preparation 12E-12H, step 1, in CH₂Cl₂ with 1.5-5 eq mCPBA and stir for 2-18 h. Concentrate in vacuo and purify by silica gel chromatography. Deprotect the Boc group using a procedure similar to that of Preparation 12A, step 3, to give the appropriate piperidine.

PREPARATION 12M

Using a procedure similar to Preparations 12C-H, steps 1 and 2, substituting glycineamide for the appropriate amine, the resulting glycineamide substituted urea/piperidine free base is prepared.

PREPARATION 12N

Step 1: Treat a solution of the product of Preparation 12A, step 1 (6.2 g, 16.5 mmol) in pyridine (100 mL) with NH_(2OH ()1.72 g, 24.7 mmol) and heat to 60° C. for 2.5 h. Cool and concentrate in vacuo and purify by silica gel chromatography, eluting with CH₂Cl₂/CH₃OH (NH₃) to obtain 5.9 g (88%) of the oxime as a white powder.

Step 2: Treat a solution of the product of step 1(5.7 g, 15 mmol) in 170 mL CH₃OH with a trace amount of methyl orange indicator followed by NaCNBH₃ (1.03 g). Add 1 M HCl/CH₃OH until mixture remains orange (ca. 23 mL). Quench with 400 mL EtOAc and 75 mL sat NaHCO₃. Filter the resulting emulsion through celite and wash with EtOAc. Wash organic layers with 75 mL saturated NaHCO₃, then brine, dry over Na₂SO₄ and concentrate in vacuo to obtain 3.82 g (67%) of the hydroxyl amine as a colorless glass.

Step 3: Dissolve the product of step 2 in 50 mL DMF and heat to 100° C. for 4 h. Concentrate in vacuo and purify by silica gel chromatography using CH₂Cl₂/CH₃OH (NH₃) to obtain 3.0 g (99%) of the hydroxyl urea.

Step 4: In a procedure similar to Preparation 12A, step 3, deprotect the Boc group to obtain the desired piperidine.

PREPARATION 12O

Step 1: Treat a solution of the product of Preparation 12A, step 1 (3.0 g, 7.13 mmol) in 1,2-dichloroethane (20 mL) with aminomorpholine (1.37 mL, 14.25 mmol) and Na(OAc)₃BH (3.0 g). Isolate the resulting hydrazone by filtering the reaction mixture through a frit and concentrating in vacuo.

Step 2: Treat a solution of the product of step 1 in 50 mL THF with 1 eq of tosic acid followed by NaCNBH₃ (2 eq). Quench with sat. NaHCO₃ and extract with EtOAc. Wash the organic layers with saturated NaHCO₃, then brine, dry over Na₂SO₄ and concentrate in vacuo. Purify by silica gel chromatography, eluting with EtOAc/hexane (2:1) with 2% Et₃N to obtain 1.5 g of the desired hydrazone.

Step 3: Dissolve the product of step 2 in 50 mL DMF and heat to 120° C. for 3 h. Concentrate in vacuo and purify by silica gel chromatography, eluting with CH₂Cl₂/CH₃OH (NH₃) to obtain 255 mg (10%, 2 steps) of the aminomorpholino urea.

Step 4: In a procedure similar to Preparation 12A, step 3, deprotect the Boc group to obtain the desired piperidine.

PREPARATION 12P

Step 1: Using a procedure similar to Preparation 12A, Step 2, substitute aminoacetonitrile for methyl amine. Dissolve the product in CH₃OH, add Raney Ni, and shake the resulting mixture on a Parr shaker at 50 psi of H₂ pressure for 3 h. Filter the mixture through celite and concentrate to give the desired product.

Step 2: Dissolve the product of Step 1 (0.17 g, 0.52 mmol) in CH₂Cl₂ and treat with methyl isocyanate (0.035 ml, 0.57 mmol) at 23° C. for 3 h. Dilute with water and CH₂Cl₂, separate the layers, and extract the aqueous layer with CH₂Cl₂ (2×40 ml), wash the combined organic layers with brine and concentrate. Purify by column chromatography using CH₂Cl₂ and CH₃OH (sat. with ammonia) at a ratio of 98:2 to give 0.68 g of product.

Step 3: Use a procedure similar to Preparation 12A, Step 3, to give the desired product.

PREPARATION 12Q-12T

Using a procedure similar to Preparation 12B, substitute for methyl isocyanate the appropriate isocyante or chloride.

PREPARATION 12U

Step 1: Dissolve the product form Preparation 12P, Step 1, in dioxane, treat with sulfamide, reflux at 100° C. for 8 h, and concentrate to give a crude product.

Step 2: Use a procedure similar to Preparation 12A, Step 3, to give the desired product.

EXAMPLE 1

Step 1: Dissolve product of Preparation 3 (11.3 g, 0.042 mol) in anhydrous dimethylformamide (DMF) (30 mL), treat it with lithium bis(trimethylsilyl)amide (1 M, 50 mL, 0.050 mol) at 0° C., allow the reaction mixture to warm up to 23° C. over 40 min. Add t-butyl bromoacetate (13.5 mL, 0.084 mol), and stir for 18 h. Quench with water and dilute with ethyl acetate (EtOAc), separate the organic layer, concentrate and purify the mixture by column chromatography eluting with CH₂Cl₂ and CH₃OH (sat. with NH₃) at a ratio of 98:2 to give 12.1 g product.

Step 2: Bubble HCl into a solution of the product of Step 1 (12.2 g, 0.032 mol) in CH₃OH (200 mL) for 15 min at 0° C. and heat the resulting solution at 60° C. for 2 h. After cooling, pour the reaction mixture into 10% aqueous NaOH solution (100 mL) and add NaHCO₃ solution (sat.) until pH=10. Separate the organic layer and further extract the aqueous layer with CH₂Cl₂ (2×100 mL), wash the combined organic layer with brine and concentrate to yield 12.3 g product.

Step 3A: Dissolve the product of Step 2 (1 g, 3.0 mmol) in CH₃OH (10 mL) add Pd(OH)₂ on carbon (150 mg), and shake the resulting mixture on a Parr shaker at 50 psi of H₂ pressure for 3 h. Filter the mixture through celite and concentrate to give a crude product. Re-dissolve the product and the aldehyde from Preparation 1 (1.5 g, 3.14 mmol) in trifluoroethanol (10 mL), treat with 3A molecular sieves (0.3 g) and NaBH₃CN (0.37 g, 6.0 mmol), and stir for 2 h. Add water (30 mL) and EtOAc (30 mL), filter the mixture through celite, separate layers of filtrate, extract the aqueous solution with EtOAc (2×40 mL), and concentrate the combined organic layer. Purify by column chromatography, eluting with CH₂Cl₂ and CH₃OH (sat. with NH₃) at a ratio of 98:2 to give 0.89 g of desired product. HRMS (FAB, M+H⁺): Calc'd: 714.1784, found: 714.1791.

Step 3B: Alternatively, to prepare optically active material, proceed in a similar manner as Step 3A using the aldehyde from Preparation 2 in place of the aldehyde from Preparation 1, dichloroethane in place of trifluoroethanol, and sodium triacetoxyborohydride in place of NaBH₃CN. HRMS (FAB, M+H⁺): Calc'd: 714.1784, found: 714.1779.

EXAMPLE 2

Step 1: Using a procedure similar to Preparations 12C-H, steps 1 and 2, and substituting serine methyl ester HCl for the appropriate amine, the resulting serine methyl ester substituted urea/piperidine free base is prepared.

Step 2: Treat the product of step 1 (3.68 mmol) in 1,2 dichloroethane (20 mL and 5 mL CF₃CH₂OH) with Preparation 2 (1.23 g, 2.45 mmol) and 3A MS (1.5g). Stir for 30 min, then add Na(OAc)₃BH (943 mg, 4.5 mmol) and stir for 1-5 h. Filter through celite and wash the celite pad with EtOAc. Transfer to a separatory funnel and wash with sat NaHCO₃ (2×50 mL) then brine, dry the organic layer with Na₂SO₄ and concentrate in vacuo. Purify by chromatography (EtOAc/NEt₃) to obtain 1.3 g of the desired product.

EXAMPLE 3

Use a procedure similar to Example 2, substituting tyrosine ethyl ester·HCl for serine methyl ester·HCl to obtain the product.

EXAMPLE 4

Ex. R²⁶ HRMS (FAB, M + H⁺) 4A

Calc'd: 700.1627, found: 700.1619 4B

Calc'd: 753.2256 found: 753.2248 4C

Calc'd: 727.2100, found: 727.2120 4D

Calc'd: 713.1943, found: 713.1937 4E

Calc'd: 699.1787, found: 699.1784 4F

Calc'd: 769.2206, found: 769.2207 4G

Calc'd: 782.2522, found: 782.2514 4H

n = 1 Calc'd: 785.1977, found: 785.1974 n = 2 Calc'd: 817.1875, found: 817.1862 4I

Calc'd: 782.1617 found: 782.1624 4J

Calc'd: 783.1569 found: 783.1570 4K

Calc'd: 728.1940. found: 728.1930 4L

Calc'd: 782.1657 found: 782.1662 4M

Calc'd: 771.2362 found: 771.2350 4N

Calc'd: 790.2097 found: 790.2103 4O

Calc'd: 740.1940 found: 740.1943 4P

Calc'd: 742.2097 found: 742.2091 4Q

Calc'd: 768.2253 found: 768.2235 4R

Calc'd: 784.2202 found: 784.2198 4S

Calc'd: 758.1868 found: 782.1862 4T

Calc'd: 806.1868 found: 806.1853 4U

Calc'd: 784.2025 found: 784.2022 4V

Calc'd: 728.1940, found: 728.1932 4W

Calc'd: 714.1784, found: 714.1776 4X

Calc'd: 741.2256, found: 741.2247 4Y

Calc'd: 686.1834 found: 686.1855 4Z

Calc'd: 700.1991 found: 700.1984 4ZZ

Calc'd: 776.2304 found: 776.2302

EXAMPLE 4A

Dissolve the product of Step 3A of Example 1 (0.50 g, 0.69 mmol) in CH₃OH (6 mL), add a solution of NaOH (60 mg, 1.5 mmol) in water (0.25 mL), and stir for 4 h. Add an equivalent of HCl (10% in water) and extract the mixture with 15% CH₃OH in CH₂Cl₂ (5×30 mL). Concentrate the combined organic layer and purify by column chromatography using 15% CH₃OH in CH₂Cl₂ to give 0.36 g of the desired product.

EXAMPLE 4B

Dissolve the product of Example 4A (60 mg, 0.086 mmol) and carbonyldiimidazole (28 mg, 0.17 mmol) in CH₂Cl₂ (1 mL), and add pyrrolidine (22 mL, 0.26 mmol) at 0° C. After stirring at 23° C. for 12 h, add water (20 mL) and CH₂Cl₂ (20 mL), separate the layers, extract the aqueous layer with CH₂Cl₂ (2×20 mL), wash the combined organic layer with brine, concentrate, and purify the mixture with column chromatography eluting with CH₂Cl₂ and CH₃OH with NH₃ (98:2) to give 47 mg of the product.

EXAMPLES 4C-4J

Prepare the compounds by reacting the product of Example 4A with an appropriate amine according to procedure similar to Example 4B.

EXAMPLE 4K

Dissolve the product of Example 4A (200 mg, 0.29 mmol), 1,3-dicyclohexylcarbodiimide (DCC) (87 mg, 0.43 mmol) and 4-dimethyl-aminopyridine (DMAP) (53 mg, 0.43 mmol) in CH₂Cl₂ (2 mL), add EtOH (25 mL, 0.43 mmol) at 0° C. After stirring at 23° C. for 12 h, add water (20 mL) and CH₂Cl₂ (20 mL), separate the layers, extract the aqueous layer with CH₂Cl₂ (2×20 mL), wash the combined organic layer with brine, concentrate and purify the mixture with column chromatography eluting with CH₂Cl₂ and CH₃OH with NH₃ (97:3) to give 165 mg of the product.

EXAMPLES 4L-4R

Prepare the target compounds by reacting the product of Example 4A with an appropriate alcohol according to a procedure similar to Example 4K.

EXAMPLE 4S-4T

Prepare the compounds using a procedure similar to Example 4K, using bis(2-oxo-3-oxazolidinyl)phosphinic chloride (BOP-Cl), Et₃N and appropriate thiols in place of DCC, DMAP and EtOH.

EXAMPLE 4V

Use a procedure similar to Example 1, Step 1, using methyl 3-bromopropionate in place of t-butyl bromoacetate, followed by debenzylation and reductive amination using a procedure similar to Example 1, Step 3.

EXAMPLE 4W

Treat the product of Example 4Y using a hydrolysis procedure similar to that of Example 4A.

EXAMPLE 4X

Treat the product of Example 4W using an amidation procedure similar to Example 4B using (CH₃)₂NH in place of pyrrolidine.

EXAMPLE 4Y

1) Dissolve the product of Preparation 11 (19 g, 44 mmol) and ethanol-amine (4 mL, 66 mmol) in dichloroethane (120 mL) and stir for 30 min. Treat with sodium triacetoxyborohydride (14 g, 66 mmol) and stir for 14 h. Add NaHCO₃ (sat.) (150 mL), extract with CH₂Cl₂ (150 mL×2), wash the combined organic layer with brine and concentrate to give 8.75 g product.

2) Treat the product of Step 1 by a procedure similar to Example 1, Step 3A, to give the product.

EXAMPLE 4Z

Dissolve the product of Example 4Y (138 mg, 0.2 mmol) in dry THF (1 mL), add NaH (16 mg, 0.4 mmol) at 0° C. and stir for 15 min. Add CH₃1 (19 mL, 0.3 mmol) at 0° C., allow the mixture to warm to 23° C., and stir for 2 h. Quench the reaction at 0° C. with water (10 mL) and dilute with EtOAc (10 mL). Separate the layers, extract aqueous solution with EtOAc (2×40 mL) and concentrate the combined organic layer. Purify by column chromatography using EtOAc and CH₃OH (99:1) with 5% Et₃N to give 103 mg product.

Example 4ZZ

Treat the product of Example 4Y using a procedure similar to Example 4Z substituting benzyl bromide for CH₃I.

EXAMPLE 5

HRMS Ex. Z (FAB, M + H⁺) 5A

Calc'd: 675.1463, found: 675.1459 5B

Calc'd: 689.1620, found: 689.1618 5C

Calc'd: 705.1569, found: 705.1565

EXAMPLE 5A-5C

Prepare the compounds by a procedure similar to Example 1, Step 3, using the products of Preparations 4, 5 and 6, respectively.

EXAMPLE 6

HRMS (FAB, M + H⁺) (unless otherwise Ex. R²⁶ specified) 6A

Calc'd: 700.1627, found: 700.1619 6B

Calc'd: 753.2256, found: 753.2254 6C

Calc'd: 727.2100, found: 727.2105 6D

Calc'd: 713.1943, found: 713.1941 6E

Calc'd: 769.2206, found: 769.2204 6F

Calc'd: 699.1791, found: 699.1787 6G

Calc'd: 785.1977, found: 785.1987 6H

Calc'd: 728.1940 found: 728.1942 6I

Calc'd: 686.1834 found: 686.1846 6J

Calc'd: 716.1754 found: 716.1744 6K

Calc'd: 714.2147 found: 714.2143 6L

Calc'd: 742.2097 found: 742.2081 6M

Calc'd: 728.1940 found: 728.1930 6N

Calc'd: 729.2070 found: 785.2061 6O H Calc'd: 642.1572, found: 642.1570 6P CH₃ LRMS: (M + H⁺) 657.9 6Q (CH₃)₂CH— LRMS: (M + H⁺) 687.0 6R

Calc'd: 722.1834, found: 722.1832 6S

Calc'd: 724.1852, found: 724.1879 6T

LRMS: (M + H⁺) 735.2 6U

LRMS: (M + H⁺) 735.2 6V

LRMS: (M + H⁺) 735.2 6W

Calc'd: 719.1838, found: 719.1849 6X

LRMS: (M + H⁺) 751.2 6Y

Calc'd: 749.1943, found: 749.1922 6Z

Calc'd: 749.1943, found: 749.1937 6AA

Calc'd: 735.1787, found: 735.1800 6BB

Calc'd: 730.1733, found: 730.1733 6CC

Calc'd: 806.2046, found: 806.2034 6DD

LRMS: (M + H⁺) 731.1 6EE

LRMS: (M + H⁺) 807.2 6FF

Calc'd: 699.1787, found: 699.1791 6GG

Calc'd: 714.1898, found: 714.1891 6HH

Calc'd: 698.1967, found: 698.1959 6II OH Calc'd: 660.1492, found: 660.1487 6JJ

LRMS: (M + H⁺) 660.2 6KK

LRMS: (M + H⁺) 717.2 6LL

Calc'd: 727.2100, found: 727.2114 6MM

Calc'd: 742.2209, found: 742.2199 6NN

LRMS: (M + H⁺) 730 6OO

LRMS: (M + H⁺) 800 6PP

Calc'd: 729.2070, found: 729.2052 6QQ

Calc'd: 765.1740, found: 765.1747 6RR

Calc'd: 766.1693, found: 766.1685

EXAMPLE 6A

Prepare the compound by a procedure similar to Example 4A using product of Example 1, Step 3B in place of the product of Example 1, Step 3A.

EXAMPLE 6B-6G

Treat the product of Example 6A with appropriate amines using an amidation procedure similar to Example 4B using 1-(3-dimethylamino-propyl-3-ethylcarbodiimide (EDC) and 1-hydroxybenzotriazole (HOBt) in place of carbonyidiimidazole.

EXAMPLE 6H-6J

Prepare the compounds by procedures similar to Examples 4K, 4Y and 4W, except using the optically pure product from Preparation 2 in place of product of Preparation 1.

EXAMPLE 6K

Dissolve the product of Example 6H (0.12 g, 0.16 mmol) in anhydous THF (2 mL) and add CH₃MgBr (3 M, 0.2 mL, 0.6 mmol) at 0° C. Warm the mixture and stir at 23° C. for 3 h. Add water and CH₂Cl₂ at 0° C., separate the layers, extract the aqueous layer with CH₂Cl₂ (2×40 mL), wash the combined organic layer with brine and concentrate. Purify by column chromatography eluting with CH₂Cl₂ and CH₃OH (99:1 to 95:5) to give 0.05 g of the product.

EXAMPLE 6L

Step 1: Use the procedure in Preparation 11, substituting N-benzyl piperidone for N-Boc-piperidone, and substituting a standard Swern oxidation for TEMPO oxidation.

Step 2: Dissolve the product of Step 1 (6.83 g, 16.6 mmol) and α,α-dimethyl glycine methyl ester hydrochloride (2.86 g, 18.6 mmol) in trifluoroethanol (32 mL) and CH₂Cl₂ (63 mL), add NaSO₄ (2.8 g) and stir for 30 min. Treat the mixture with sodium triacetoxy borohydride and stir for additional 4 h. Filter off the solid and concentrate to yield the crude product. Purify by column chromatography eluting with EtOAc and CH₃OH (99:1 to 95:5) to give 7.65 g product.

Step 3: Dissolve the product of Step 2 (1.54 g, 3 mmol) in toluene (140 mL) and heat in a sealed tube at 120° C. for 40 h. Cool and remove the solvent, re-dissolve in EtOAc and CH₂Cl₂, wash with 1 N NaOH, brine and concentrate to yield 0.97 g product.

Step 4: Treat the product in Step 3 using a procedure similar to Preparation 3, Step 3, to give the product.

EXAMPLE 6M

Step 1: Treat the product of Step 3 of Example 6L with a hydrolysis procedure similar to Example 6A, but reflux at 70° C. for 24 h.

Step 2: Treat the product of Step 1 using a procedure similar to Example 1, Step 3 to give the product.

EXAMPLE 6N

Treat the product of Example 6M with an amidation procedure similar to Example 4E to give the product.

EXAMPLE 6O

Step 1: Dissolve the product of Preparation 3, step 3 (2.0g, 7.5 mmol) in CH₃OH (50 mL) and treat with Pd(OH)₂ (20% on C, 50% H₂O) followed by H₂ (40 psi). After shaking for 17 h on Parr shaker, filter through celite and concentrate to obtain the desired piperidine (1.33 g, 7.3 mmol, 98%).

Step 2: Treat the product of step 1 (2.13g, 4.5 mmol) in 1,2-dichloroethane (15 mL) with Preparation 2 (1.42 g, 3.0 mmol) and 3ÅMS (2g). Stir for 30 min and then add Na(OAc)₃BH (943 mg, 4.5 mmol) and stir for 1-5 h. Filter through celite and wash the celite pad with EtOAc. Transfer to a separatory funnel, wash with sat NaHCO₃ (2×50 mL), brine and dry the organic layer with Na₂SO₄ and concentrate in vacuo. Purify by chromatography (EtOAc/NEt₃—>EtOAc/NEt₃/CH₃OH gradient) to obtain 810 mg of the desired product.

EXAMPLE 6P THROUGH 6AA, 6FF, 6II, AND 6LL-6RR

Use the appropriate piperidine from Preparation 12A through 12L, 12M, 12N, and 12O-12U and the aldehyde from Preparation 2 in a procedure similar to example 6O, step 2 to obtain the title compounds.

EXAMPLE 6BB

Use the product of Example 2 in a procedure similar to Example 4A to obtain the corresponding carboxylic acid compound.

EXAMPLE 6CC

Use the product of Example 3 in a procedure similar to Example 4A substituting LiOH for NaOH and aqueous DME for CH₃OH to obtain the corresponding carboxylic acid title compound.

EXAMPLES 6DD and 6EE

With Examples 6BB and 6CC as the starting carboxylic acids, use a procedure similar to Example 4K using HOBT in place of DMAP and using NH₃ in THF as the amine to obtain Examples 6DD and 6EE, respectively.

EXAMPLE 6GG

Step 1: Cool a suspension of dry NH₄Cl (58 mg) in benzene (5 mL) to 0° C. and treat with 525 μL of 2M trimethylaluminum in toluene. Warm to 23° C. and stir for 1 h. Add 250 mg of example 6FF and heat the mixture to reflux for 2.5 h. Cool and remove the solvent in vacuo and purify the resulting nitrile by silica gel chromatography using CH₂Cl₂/CH₃OH(NH₃)(95:5) as the eluant to obtain 140 mg (57%) of the nitrile.

Step 2: Sonicate a mixture of NH₂OH (152 mg, 2.21 mmol) in dry EtOH (5 mL) and 1 N KOH/CH₃OH (1.76 mL) for 15 min. Add this suspension to a solution of the product of step 1 (300 mg) in dry EtOH (7 mL) with 3ÅMS and heat to reflux for 2 h. Quench with saturated NaHCO₃, dilute with EtOAc (150 mL), filter through a frit and concentrate in vacuo. Purify by silica gel chromatography using CH₂Cl₂/CH₃OH(NH₃)(97:3→95:5) to obtain the title compound.

EXAMPLE 6HH

Treat a solution of the product of Example 6GG, step 1 (300 mg) in CH₃OH (5 mL) with 47 mg of NaOCH₃ and stir for 18 h at 23° C. Add dry NH₄Cl and stir for 4 h. Remove the solvent in vacuo and purify by silica gel chromatography using CH₂Cl₂/CH₃OH(NH₃)(95:5→80:10) to obtain 262 mg (86%) of the title compound.

EXAMPLE 6JJ

Treat a solution of example 6II (250 mg, 0.38 mol) and 46 μL (0.57 mmol) of pyridine in 3 mL CH₂Cl₂ with methylisocyanate (33.5 μL, 0.57 mmol) and stir for 3 h. Remove the solvent in vacuo and purify by silica gel chromatography using CH₂Cl₂/CH₃OH(NH₃)(95:5) to obtain 226 mg (83%) of the title compound.

EXAMPLE 6KK

Step 1: Treat a solution of Example 6II (500 mg, 0.76 mol) in dry DMF (10 mL) at 0° C. with NaH (46 mg, 60%) and stir for 30 min. Add methylbromoacetate (86 μL, 0.914 mmol) stir for 30 min and quench with 3 mL saturated NaHCO₃. Extract with EtOAC, filter through a frit, wash with saturated NaHCO₃, brine, dry with Na₂SO₄ and concentrate in vacuo. Purify by silica gel chromatography using CH₂Cl₂/CH₃OH(NH₃)(97:3) to obtain 440 mg (79%) of the methyl ester.

Step 2: Treat a solution of the product of step 1 (389 mg) with CH₃OH saturated with NH₃ (20 mL) and sonicate for 2 h. Concentrate in vacuo. Purify by silica gel chromatography using CH₂Cl₂/CH₃OH(NH₃)(95:5) to obtain 300 mg (79%) of the title compound.

EXAMPLE 7

Ex. E HRMS (FAB, M + H⁺) 7A

Calc'd: 602.2665 found: 602.2674 7B

Calc'd: 610.2163 found: 610.2181 7C

Calc'd: 639.2020 found: 639.2006 7D

Calc'd: 710.2116 found: 710.2099 7E

Calc'd: 642.2226 found: 642.2226 7F

Calc'd: 618.2272 found: 618.2264

EXAMPLE 7A

Step 1: Dissolve the product of Preparation 7 (1.0 g, 1.36 mmol), EDC (0.38 g, 2.00 mmol) and HOBt (0.24 g, 1.8 mmol) in CH₂Cl₂ (5 mL), add 3,5-dimethyl benzoic acid (0.3 g, 2.00 mmol) and Et₃N (.7 mL, 4.00 mmol) at 0° C. After stirring at 23° C. for 12 h, add water (20 mL) and CH₂Cl₂ (20 mL), separate the layers, extract the aqueous layer with CH₂Cl₂ (2×20 mL), wash the combined organic layer with brine, concentrate and purify the mixture with column chromatography using CH₂Cl₂ and CH₃OH with NH₃ (98:2) to give 0.22 g product.

Step 2: Dissolve the product of Step 1 (0.22 g, 0.25 mmol) in dry THF (2 mL), treat the solution with tetrabutylammonium fluoride (1 M, 0.3 mL, 0.30 mmol) at 0° C. Allow the mixture to warm up to 23° C. over 30 min and stir additional 1 h. Dilute with EtOAc (50 mL) and water (50 mL), extract aqueous phase with EtOAc (2×40 mL) and concentrate the combined organic layer. Purify by column chromatography using EtOAc and hexane (1:1) to obtain 0.15 g product.

Step 3: Dissolve the product of Step 2 (140 mg, 0.32 mmol) in EtOAc (3 mL), prepare a solution of NaBr (33 mg, 0.32 mmol) in 3 mL of saturated aqueous NaHCO₃, and add to the reaction vessel. Add TEMPO (1 mg). With vigorous stirring, add 1 mL of commercial bleach (ca 0.7 M, 0.7 mmol). Add saturated aqueous Na₂S₂O₃ (3 mL), isolate the organic layer and extract the aqueous layer with CH₂Cl₂. Combine the organic layers, wash with saturated aqueous NaHCO₃, and concentrate to give 140 mg aldehyde as the product.

Step 4: Hydrogenate the product of Preparation 3 using a procedure similar to that described in Example 1, Step 3. React the resulting deprotected product with the aldehyde from Step 3 in a similar procedure to that described in Example 1, Step 3, to yield the title product.

EXAMPLE 7B-7F

Prepare the compounds by a procedure similar to Example 7A using appropriate aryl acids.

EXAMPLE 8

Ex. R²⁹ HRMS (FAB, M + H⁺) 8A

Calc'd: 642.1572 found: 642.1555 8B

Calc'd: 656.1729 found: 656.1714 8C

Calc'd: 684.1678 found: 684.1660 8D

Calc'd: 746.1834 found: 746.1837 8E

Calc'd: 742.1733 found: 742.1734 8F

LRMS 699 (M + 1) 8G

Calc'd: 728.1940 found: 728.1934 8H

Calc'd: 714.1784 found: 714.1788 8I

Calc'd: 713.1943 found: 713.1944 8J

Calc'd: 701.1757 found: 701.1767 8K

Calc'd: 734.1504 found: 734.1523 8L

Calc'd: 721.1300 found: 721.1308

EXAMPLE 8A

Step 1: Treat the product of Preparation 8 (240 mg, 0.88 mmol) in CH₂Cl₂ (3 mL) with 2-(trimethylsilyl)ethyl 4-nitrophenyl carbonate (350 mg, 1.24 mmol), and stir for 14 h. Add water and CH₂Cl₂, and extract the aqueous layer with CH₂Cl₂ (2×20 mL), wash the combined organic layer with brine, concentrate and purify the mixture with column chromatography using CH₂Cl₂ and CH₃OH with NH₃ (98:2) to give 149 mg product.

Step 2: Treat the product of Step 1 using a procedure similar to Step 3A of Example 1. Alternatively, for optically pure product, use a procedure similar to Step 3B of Example 1.

Step 3: Treat the product of Step 2 (190 mg, 0.24 mmol) in THF (2 mL) with tetrabutylammonium fluoride (1M, 0.5 mL, 0.50 mmol), and stir for 3 h. Add water and CH₂Cl₂, and extract the aqueous layer with CH₂Cl₂ (2×20 mL), wash the combined organic layer with brine, concentrate and purify the mixture with column chromatography using CH₂Cl₂ and CH₃OH with NH₃ (95:5) to give 119 mg of the title product.

EXAMPLE 8B

Step 1: Treat the product of Preparation 8 (320 mg, 1.17 mmol) in THF (3 mL) with NaH (60% in mineral oil, 56 mg, 1.41 mmol) at 0° C. for 15 min, and add CH₃l (88 mL, 1.41 mmol). After stirring for 2 h, quench with water and CH₂Cl₂, extract the aqueous layer with CH₂Cl₂ (2×20 mL), wash the combined organic layer with brine, concentrate and purify the mixture with column chromatography using CH₂Cl₂ and CH₃OH with NH₃ (95:5) to give 180 mg product.

Step 2: Treat the product of Step 1 using a procedure similar to Step 3B of Example 1 to give the title compound.

EXAMPLE 8C

Step 1: Treat the product of Preparation 8 (250 mg, 0.92 mmol) in CH₂Cl₂ (3 mL) with ET₃N and acetyl chloride (90 mg, 1.19 mmol), and stir for 2 h. Add water and CH₂Cl₂, extract the aqueous layer with CH₂Cl₂ (2×20 mL), wash the combined organic layer with brine, concentrate and purify the mixture with column chromatography using CH₂Cl₂ and CH₃OH with NH₃ (95:5) to give 230 mg product.

Step 2: Treat the product of Step 1 using a procedure similar to Step 3 of Example 1 to give the title compound.

EXAMPLES 8D-F and 8K

Prepare the desired compounds by a procedure similar to that described in Example 8C using appropriate the acyl halide, isocyanate or sulfonyl chloride.

EXAMPLES 8G and 8H

Prepare the desired compounds by a procedure similar to that described in example 8B using appropriate alkyl halides.

EXAMPLES 8I and 8J

Prepare the target compounds by stirring a mixture of NH₄OH and NH₄Cl with the products Examples 8G and 8H in CH₃OH for 48 h.

EXAMPLE 8L

Treat the product of Preparation 8 (250 mg, 0.92 mmol) in 1,4-dioxane (39 mL) with sulfamide (0.6 g, 6.3 mmol), and reflux for 24 h at 80° C. Concentrate and purify the mixture with column chromatography using CH₂Cl₂ and CH₃OH with NH₃ (95:5) to give 150 mg of the title product.

EXAMPLE 9

Ex. R²⁹ HRMS (FAB, M + H⁺) 9A

Calc'd: 656.1365 found: 656.1357 9B

Calc'd: 670.1521 found: 670.1514 9C

Calc'd: 728.1576 found: 728.1571 9D

Calc'd: 714.1420 found: 714.1438 9E

Calc'd: 769.1842 found: 769.1838 9F

Calc'd: 713.1580 found: 713.1569

EXAMPLE 9A

Treat the product of Preparation 9 using a procedure similar to Step 3A of Example 1. Alternatively, prepare the optically pure compound using a procedure similar to Example 1, Step 3B.

EXAMPLE 9B

Treat the product of Preparation 9 using a procedure similar to Example 8B to give the target compound.

EXAMPLE 9C

Treat the product of Preparation 9 using a procedure similar to Example 8H to give the title compound.

EXAMPLE 9D

Hydrolyze the product of Example 9C using a procedure similar to that described in Example 4A.

EXAMPLES 9E-9G

Acylate the product of Example 9D using a procedure similar to that described in Example 6G with appropriate amines.

EXAMPLE 10

Ex. R²⁹ HRMS (FAB, M + H⁺) 10A

*LRMS: 730.1 (M + 1) 10B

Calc'd: 714.1420 found: 714.1438 10C

Calc'd: 769.1842 found: 769.1848 10D

Calc'd: 713.1580 found: 713.1593 10E

Calc'd: 727.1736 found: 727.1733 10F

Calc'd: 741.1893 found: 741.1882 10G

Calc'd: 799.1770 found: 799.1767 10H

Calc'd: 783.1998 found: 783.2006 10I

Calc'd: 767.2049 found: 767.2054

EXAMPLE 10A

Prepare title compound by a procedure similar to Preparation 9 using L-N-Boc-aspartic acid methyl ester in place of glycine methyl ester.

EXAMPLES 10B-10I

Prepare the desired compounds by standard hydrolysis and acylation procedures similar to those described in Examples 9D-9G.

EXAMPLE 11

Ex. R²⁹ HRMS (FAB, M + H⁺) 11A

Calc'd: 713.1580 found: 713.1593 11B

Calc'd: 783.1998 found: 783.2012 11C

Calc'd: 767.2049 found: 767.2061 11D

Calc'd: 769.1842 found: 769.1817

EXAMPLES 11A-11D

Prepare the desired compounds by procedures similar to Example 10, using D-N-Boc-aspartic acid benzyl ester in place of L-N-Boc-aspartic acid methyl ester.

EXAMPLE 12

Ex. R²⁶ HRMS (FAB, M + H⁺) 12A

Calc'd: 628.1416 found: 628.1434 12B

Calc'd: 714.1784 found: 714.1765 12C

Calc'd: 686.1471 found: 686.1482 12D

Calc'd: 687.1601 found: 687.1603 12E

Calc'd: 755.2049 found: 755.2047 12F

Calc'd: 714.1784 found: 714.1776 12G

Calc'd: 728.1940 found: 728.1945 12H

Calc'd: 713.1943 found: 713.1945 12I H₃C— Calc'd: 642.1572 found: 642.1562

EXAMPLE 12A

Step 1: Dissolve the product of Preparation 8, Step 1 (2.7 g, 8.1 mmol) in CH₂Cl₂ (40 mL), treat with 4 M HCl in dioxane (40 mL, 160 mmol) and stir for 2 h. Remove solvent under reduced pressure to yield a crude product. Re-dissolve the product in THF (45 mL), treat with carbonyldiimidazole (2.26 g, 13.9 mmol) and reflux for 24 h. Remove solvent under reduced pressure and dilute with CH₂Cl₂ and NaHCO₃. Separate the organic layer, concentrate and purify the mixture with column chromatography using CH₂Cl₂ and CH₃OH with NH₃ (96:4) to give 1.8 g product.

Step 2: Treat the product of Step 1 by a procedure similar to Example 1, Step 3 to give the product.

EXAMPLE 12B

Step 1: Use a procedure described in Preparation 11, substituting 2-amino-ethanol for 3-amino-i-propanol to obtain the product.

Step 2: Treat the product of Step 1 by a procedure similar to Preparation 12A using glycine ethyl ester in place of methylamine.

Step 3: Treat the product of Step 2 by a procedure similar to Example 1, Step 3, using acid deprotection (HCl in CH₂Cl₂) in place of hydrogenation.

EXAMPLE 12C

Hydrolyze the product of Example 12B in a manner similar to Example 4A to give the desired product.

EXAMPLES 12D and 9E

Treat the product of Example 12C by an amidation procedure similar to that described in Example 4E to give the title product.

EXAMPLE 12F

Step 1: Use the procedure of Preparation 11, substituting 2-aminoethanol for 3-amino-1-propanol.

Step 2: Treat the product of Step 1 using a procedure similar to Example 6L, Steps 2-4, to obtain the title compound.

EXAMPLES 12G-12H

Treat the product of Example 12F using a procedure similar to Examples 6M and 6N to obtain the title compounds.

EXAMPLE 12I

Treat the product of Example 12F, Step 1, using a procedure similar to Example 6P to obtain the title compound.

EXAMPLE 13

Ex. Z MS 13A

Calc'd: 643.1412 found: 643.1419 13B

Calc'd: 659.1362 found: 659.1363

EXAMPLE 13A

Treat the product of Preparation 10 using a procedure similar to Example 1, Step 3 to yield the title compound.

EXAMPLE 13B

Treat the product of Example 13A using a procedure similar to that described in Preparation 12I-12L to yield the title compound.

EXAMPLE 14

Ex. R1 MS (FAB): m/e 14A

Calc'd: 757.1954 found: 757.1945 14B

Calc'd: 771.2111 found: 771.2099 14C

Calc'd: 829.2278 found: 829.2269

EXAMPLE 14A

Step 1: Treat 3,5-dichloro-N-[3-(3,4-dichlorophenyl)-2-[[hydroxyimino]-6-methyl-5-heptenyl]-N-methylbenzamide (4.2g, 8.6 mmol) in dry DMF(40 mL) at 0° C. with KHMDS (0.5 M, toluene, 19 mL) keeping the internal temperature to <5° C. After stirring for 30 min, add bromoacetonitrile (655 μL, 9.4 mmol) and stir for 10 min. Pour the mixture into EtOAc (150 mL)/sat NaHCO₃ (75 mL). Extract the aqueous layer, wash the combined organic layers with brine, dry with Na₂SO₄ and concentrate in vacuo. Purify by silica gel chromatography eluting with hexane/EtOAc to obtain 3.83 g (85%) of the nitrile as a colorless foam.

Step 2: Cool a solution of the olefin (3.83 g) from step 1 (in dry CH₂Cl₂ (50 mL) to −78° C. and treat with ozone for 7 min. Treat the solution with dimethylsulfide (5.3 mL, 72.6 mmol, 10 eq). Allow the solution to warm to 23° C. and stir for 2.5h. Dilute the solution with CH₂Cl₂ (50 mL) and wash with 10% Na₂S₂O₄. Wash the organic layers with brine, dry with Na₂SO₄ and concentrate in vacuo to give the aldehyde.

Step 3: Treat the product of step 2 using a procedure similar to Example 6FF.

Step 4: Treat the product of step 3 using a procedure similar to that of Example 6GG to obtain the corresponding hydroxyamidine.

EXAMPLE 14B

Treat Example 14A using a procedure similar to that of Example 14A, step 1, using LHMDS in place of KHMDS and CH₃l as the alkylating agent to obtain the title compound.

EXAMPLE 14C

Treat the product of Example 14A using a procedure similar to that of Example 14A, step 1, and then step 4 to give the desired compound.

EXAMPLE 15

Ex. R¹ HRMS (FAB): m/e 15A

Calc'd: 700.1739 found: 771.2099 15B

Calc'd: 685.1630 found: 685.1627

EXAMPLE 15A

Use a procedure similar to that of Example 14A using the product of example 60, step 1 as the piperidine in the reductive amination for step 3. Proceed to step 4 to give the title compound.

EXAMPLE 15B

Use a procedure similar to that for Example 6A using methylbromoacetate in place of bromoacetonitrile. Proceed through the reductive amination with the product of Example 6O, step 1 to give the methyl ester. Stir the resulting methyl ester with CH₃OH saturated with NH₃ for 18h. Concentrate in vacuo and purify by silica gel chromatography to give the title compound.

EXAMPLE 16

Treat the product of Example 14A, step 3 to a procedure similar to that of Example 6GG to give the title compound. HRMS (FAB, m/e): Calc'd: 772.2063; found: 772.2059.

EXAMPLE 17

Step 1: Using a procedure similar to Preparation 12C-12H and substituting glycine methylester for the appropriate amine, prepare the corresponding cyclic urea/Boc piperidine.

Step 2: Using a procedure similar to Example 4A, hydrolyze the methyl ester to the carboxylic acid.

Step 3: Using a procedure similar to Example 4B to prepare the

Step 4: Using a procedure similar to Preparation 12A, step 3, deprotect the Boc group and isolate the free base of the resulting piperdine.

Step 5: Use the product of step 4 in a procedure similar to Example 14A, steps 3 and 4 to prepare the title compound. HRMS (FAB, M+H⁺): Calc'd: 811.2424; found: 811.2441.

EXAMPLE 18

Ex. R²⁶ HRMS (FAB, M + H⁺) 18A H Calc'd: 676.1416 Found: 676.1389 18B CH₃— Calc'd: 692.1543 Found: 692.1558 18C

Calc'd: 748.1627 Found: 748.1621 18D

Calc'd: 734.1471 Found: 734.1487

EXAMPLE 18A

Treat 4-(2-keto-1-benzimidazolinyl)-piperidine and the product of Preparation 2 using the procedure of Example 2, Step 2, to give the title compound.

Examples 18B-18D

Treat the product of Example 18A using the procedure in Examples 9B, 9C and 9D to give the title compounds.

EXAMPLE 19

Ex. R²⁶ HRMS (FAB, M + H⁺) 19A CH₃O(CH₂)₂— Calc'd: 772.1852 Found: 772.1859 19B CH₃O(CH₂)₂NHC(O)CH₂— Calc'd: 805.2206 Found: 805.2195

EXAMPLE 19A

Step 1: Treat Boc-4-(2-keto-1-benzimidazolinyl)-piperidine (3.0 g, 9.46 mmol) with a preheated mixture of NaOH (1.14 g, 28.2 mmol), K₂CO₃ (2.61 g, 18.9 mmol) and nBuNHSO₄ (0.305 g, 0.9 mmol) in toluene (75 ml) for 30 min., add 2-bromomethoxyethane (1.33 ml, 14.2 mmol) and heat at 80° C. for an additional hour. Upon cooling, treat the mixture with water and EtOAc, adjust pH to 7 using 10% citric acid. Extract with EtOAc, dry the organic layer with Na₂SO₄ and concentrate in vacuo to give a crude product.

Step 2: Deprotect the Boc group of the product of Step 1 using a similar procedure as in Preparation 12A, Step 3. Treat the product using a procedure similar to Example 1, Step 3B, using the corresponding optically pure aldehyde (prepared as in Preparation 1) to give the desired product.

EXAMPLE 19B

Use a procedure similar to that of Example 18C using the corresponding aldehyde (prepared as in Preparation 1) to give a product. Dissolve the product (0.5 g, 0.655 mmol) in 2-methoxyethylamine (10 ml), and heat at 60° C. for 24 h. Upon cooling, treat the mixture with water and EtOAc. Extract with EtOAc, dry the organic layer with Na₂SO₄ and concentrate in vacuo to give a crude product. Purify by silica gel chromatography, eluting with CH₂Cl₂/CH₃OH gradient elution (99:1-97:3) to obtain 0.277 g of the desired product.

Compounds of formula I have been found to be antagonists of NK₁ and/or NK₂ and/or NK₃ receptors, and are therefore useful in treating conditions caused or aggravated by the activity of said receptors.

The in vitro and in vivo activity of the compounds of formula I can be determined by various procedures known in the art, such as a test for their ability to inhibit the activity of the NK₁ agonist Substance P, an isolated hamster trachea NK₂ assay, a test of the effect of NK₁ antagonists on Substance P-induced airway microvascular leakage, measurement of NK₂ activity in vivo in guinea pigs, measurement of bronchoconstriction due to NKA, and neurokinin receptor binding assay(s). NK₃ activity is determined by following a procedure similar to that described in the literature, e.g., Molecular Pharmacol., 48 (1995), p. 711-716. Typical procedures for determining NK₁ and NK₂ activity are described in U.S. Pat. No. 5,696,267, incorporated herein by reference.

% Inhibition of neurokinin agonist activity is the difference between the percent of maximum specific binding (MSB) and 100%. The percent of MSB is defined by the following equation, wherein “dpm” is disintegrations per minute: ${\% \quad {MSB}} = {\frac{\left( {{dpm}\quad {of}\quad {unknown}} \right) - \left( {{dpm}\quad {of}\quad {nonspecific}\quad {binding}} \right)}{\left( {{dpm}\quad {of}\quad {total}\quad {binding}} \right) - \left( {{dpm}\quad {of}\quad {nonspecific}\quad {binding}} \right)} \times 100}$

It will be recognized that compounds of formula I exhibit NK₁, NK₂ and/or NK₃ antagonist activity to varying degrees, e.g., certain compounds have strong NK₁ antagonist activity, but weaker NK₂ and NK₃ antagonist activity, while others are strong NK₂ antagonists, but weaker NK₁ and NK₃ antagonists. While compounds with approximate equipotency are preferred, it is also within the scope of this invention to use compounds of with unequal NK₁/NK₂/NK₃ antagonist activity when clinically appropriate.

Using the test procedures known in the art, the following data (% inhibition or Ki) were obtained for preferred and/or representative compounds of formula I:

Ex. Ki (NK₁) (nM) Ki (NK₂) (nM) Ki (NK₃) (nM)  5B 0.9 2.8 —  6E 1.0 1.0 1.5  6K 0.5 0.8 0.5  6Y 0.4 0.4 0.4  8A 1.1 0.7 1.2 10B 2.9 28.9 34.6 11A 0.8 1.0 1.9  7F 1.8 0.4 3.8 16 0.4 0.4 0.7 18A 1.2 1.0 9.8  6M 0.9 0.5 0.3  6S 1.0 0.9 2.1

Compounds of the present invention exhibit a range of activity: percent inhibition at a dosage of 1 μM ranges from about 0 to about 100% inhibition of NK₁ and/or about 0 to about 100% inhibition of NK₂. Preferred are compounds having a Ki≦20 nM for the NK₁ receptor. Also preferred are compounds having a Ki≦20 nM for the NK₂ receptor. Another group of preferred compounds are those having a Ki≦20 nM for each of the NK₁ and NK₂ receptors. 

We claim:
 1. A compound represented by the structural formula

or a pharmaceutically acceptable salt thereof, wherein: a is 0, 1, 2 or 3; b and d are independently 0, 1 or 2; R is H, C₁₋₆ alkyl, —OR⁶ or —F; A is ═N—OR¹ or ═N—N(R²)(R³); when d is not 0, X is a bond, —C(O)—, —O—, —NR⁹—, —S(O)_(e)—, —N(R⁶)C(O)—, —C(O)N(R⁶)—, —OC(O)NR⁶—, —OC(═S)NR⁶—, —N(R⁶)C(═S)O—, —S(O)₂N(R⁶)—, —N(R⁶)S(O)₂—, —N(R⁶)C(O)O—, —OC(O)— or —N(R⁶)C(O)NR⁷—; and when d is 0, X is a bond or —NR⁶—; T is H, R⁴-aryl, R⁴-heterocycloalkyl or R⁴-heteroaryl; Q is R⁵-phenyl, R⁵-naphthyl or R⁵-heteroaryl; R¹ is H, C₁₋₆ alkyl, —(C(R⁶)(R⁷))_(n)—G, —G², —(C(R⁶)(R⁷))_(p)—M—)(C(R¹³)(R¹⁴))_(n)—G or —(C(R⁶)(R⁷))_(p)—M—(R⁴-heteroaryl); R² and R³ are independently selected from the group consisting of H, C₁₋₆ alkyl, —(C(R⁶)(R⁷))_(n)—G, —G² and —S(O)_(e)R¹³; or R² and R³, together with the nitrogen to which they are attached, form a ring of 5 to 6 members, wherein 0, 1 or 2 ring members are selected from the group consisting of —O—, —S— and —N(R¹⁹)—; R⁴ and R⁵ are independently 1-3 substituents independently selected from the group consisting of H, halogeno, —OR⁶, —OC(O)R⁶, —OC(O)N(R⁶)(R⁷), —N(R⁶)(R⁷), C₁₋₆ alkyl, —CF₃, —C₂F₅, —COR⁶, —CO₂R⁶, —CON(R⁶)(R⁷), —S(O)_(e)R¹³, —CN, —OCF₃, —OCHF₂, —NR⁶CO₂R¹⁶, —NR⁶COR⁷, —NR⁸CON(R⁶)(R⁷), NO₂, —N(R⁶)S(O)₂R¹³ or —S(O)₂N(R⁶)(R⁷); or adjancent R⁴ substituents or adjacent R⁵ substituents can form a —O—CH₂—O— group; R⁶, R⁷, R⁸, R¹³ and R¹⁴ are independently selected from the group consisting of H, C₁₋₆ alkyl, C₂-C₆ hydroxyalkyl, C₁-C₆ alkoxy-C₁-C₆ alkyl, R¹⁵-phenyl, and R¹⁵-benzyl; R⁹ is independently selected from the group consisting of R⁶ and —OR⁶; or R⁶ and R⁷, or R⁷ and R⁹, together with the nitrogen to which they are attached, form a ring of 5 to 6 members, wherein 0, 1 or 2 ring members are selected from the group consisting of —O—, —S— and —N(R¹⁹)—; R^(6a), R^(7a), R^(8a), R^(9a), R¹⁰ and R^(10a) are independently selected from the group consisting of H and C₁₋₆ alkyl; R¹⁵ is 1 to 3 substituents independently selected from the group consisting of H, —OH, C₁-C₆ alkyl, C₁-C₆ alkoxy, C₁-C₆ alkylthio, halogeno, —CF₃, —C₂F₅, —COR¹⁰, —CO₂R¹⁰, —C(O)N(R¹⁰)₂, —S(O)_(e)R^(10a), —CN, —N(R¹⁰)COR¹⁰, —N(R¹⁰)CON(R¹⁰)₂ and —NO₂; R¹⁶ is C₁₋₆ alkyl, R¹⁵-phenyl or R¹⁵-benzyl; R¹⁹ is H, C₁-C₆ alkyl, —C(O)N(R¹⁰)₂ or —CO₂R¹⁰; n and p are independently 1-6; G is selected from the group consisting of H, R⁴-aryl, R⁴-hetero-cycloalkyl, R⁴-heteroaryl, R⁴-cycloalkyl, —CH₂F, —CHF₂, —CF₃, —OR⁶, —N(R⁶)(R⁷), —COR⁶, —CO₂R⁶, —CON(R⁷)(R⁹), —S(O)_(e)R¹³, —NR⁶CO₂R¹⁶, —NR⁶COR⁷, —NR⁸CON(R⁶)(R⁷), —N(R⁶)S(O)₂R¹³, —N(R⁶)S(O)₂N(R³³)(R³⁴), —S(O)₂N(R⁶)(R⁷), —OC(O)R⁶, —OC(O)N(R⁶)(R⁷), —C(═NOR⁸)N(R⁶)(R⁷), —C(═NR²⁵)N(R⁶)(R⁷), —N(R⁸)C(═NR²⁵)N(R⁶)(R⁷), —CN, —C(O)N(R⁶)OR⁷, and —C(O)N(R⁹)-(R⁴-heteroaryl), provided that when n is 1, G is not —OH or —N(R⁶)(R⁷); M is selected from the group consisting of a double bond, —O—, —N(R⁶)—, —C(O)—, —C(R⁶)(OR⁷)—, —C(R⁸)(N(R⁶)(R⁷))—, —C(═NOR⁶)N(R⁷)—, —C(N(R⁶)(R⁷))═NO—, —C(═NR²⁵)N(R⁶)—, —C(O)N(R⁹)—, —N(R⁹)C(O)—, —C(═S)N(R⁹)—, —N(R⁹)C(═S)— and —N(R⁶)C(O)N(R⁷)—, provided that when n is 1, G is not OH or —NH(R⁶); and when p is 2-6, M can also be —N(R⁶)C(═NR²⁵)N(R⁷)— or —OC(O)N(R⁶)—; G² is R⁴-aryl, R⁴-heterocycloalkyl, R⁴-heteroaryl, R⁴-cycloalkyl, —COR⁶, —CO₂R¹⁶, —S(O)₂N(R⁶)(R⁷) or —CON(R⁶)(R⁷); e is 0, 1 or 2, provided that when e is 1 or 2, R¹³ and R^(10a) are not H; R²⁵ is H, C₁-C₆ alkyl, —CN, R¹⁵-phenyl or R¹⁵-benzyl; Z is

j is 0-2; X¹ is —O—, —S— or —NR⁹—; J¹ and J² are independently selected from the group consisting of two hydrogen atoms, ═O, ═S, ═NR⁹ and ═NOR¹; R²⁷ and R²⁹ are independently selected from the group consisting of H, C₁₋₆ alkyl, —(C(R⁶)(R⁷))_(n)—G, —G², —C(O)—(C(R⁸)(R⁹))_(n)—G and —S(O)_(e)R¹³; R²⁸ is H, —(C(R⁶)(R⁷))_(t)—G or —CON(R⁶)(R⁷); t is 0, 1, 2 or 3, provided that when j is 0, t is 1, 2 or 3; and R³³ and R³⁴ are independently selected from the group consisting of H, C₁-C₆ alkyl, R¹⁵-phenyl and R¹⁵-benzyl; wherein heteroaryl is a 5- to 10-membered single or benzofuzed aromatic ring comprising 1 to 4 heteroatoms independently selected from the group consisting of —O—, —S— and —N═, provided that the rings do not include adjacent oxygen atoms, adjacent sulfur atoms, or adjacent oxygen and sulfur atoms; and wherein heterocycloalkyl is a 4- to 6-membered saturated ring comprising 1 to 3 heteroatoms independently selected from the group consisting of —O—, —S— and —N(R¹⁹)—, with the remaining members being carbon.
 2. A compound of claim 1 wherein d is not 0 and X is —O—, —C(O)—, a bond, —NR⁹—, —S(O)_(e)—, —N(R⁶)C(O)—, —C(O)NR⁶ or —OC(O)NR⁶—.
 3. A compound of claim 1 wherein T is R⁴-aryl or R⁴-heteroaryl.
 4. A compound of claim 1 wherein Q is R⁵-phenyl.
 5. A compound of claim 1 selected from the group of compounds represented by the formula

wherein Z, R¹ and T are as defined in the table: Z R¹ T

—CH₃

—CH₃

—CH₃

—CH₃

—CH₃

—CH₃

—CH₃

—CH₃

—CH₃


6. A pharmaceutical composition comprising an effective amount of a compound of claim 1 and a pharmaceutically acceptable carrier.
 7. A method of treating asthma, allergy, cough, bronchospasm, anxiety, nociception, or depression, comprising administering an effective amount of a compound of claim 1 to a mammal in need of such treatment. 